I just rebuilt my quad and put the motor in, fixed an electrical issue, and put a new battery in it. This thing has a hard time starting and just randomly decides to bog down and die. I put Wiesco valves, Wiesco timing chain, Wiesco High Compression Piston and rings, and a quad boss top end gasket set in it. I had a cycle mechanic put the valves in and shim them correctly. So it can't be the valves. And after I got it all back together I drained the gas and put some new 92 grade gas in it. I cleaned the air filter really good also. I put a NGK Iridium spark plug in it. I just took that off. Im going to check the gap and make sure its correct. Then if it is, take the carb off and spray it out with brake cleaner. Im taking the jets out to clean them up real good too. What do you think my issue might be ?